drivers/isdn/capi/capi.c

   1 /* $Id: capi.c,v 1.1.2.7 2004/04/28 09:48:59 armin Exp $
   2  *
   3  * CAPI 2.0 Interface for Linux
   4  *
   5  * Copyright 1996 by Carsten Paeth <calle@calle.de>
   6  *
   7  * This software may be used and distributed according to the terms
   8  * of the GNU General Public License, incorporated herein by reference.
   9  *
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/errno.h>
  14 #include <linux/kernel.h>
  15 #include <linux/major.h>
  16 #include <linux/sched.h>
  17 #include <linux/slab.h>
  18 #include <linux/fcntl.h>
  19 #include <linux/fs.h>
  20 #include <linux/signal.h>
  21 #include <linux/mutex.h>
  22 #include <linux/mm.h>
  23 #include <linux/smp_lock.h>
  24 #include <linux/timer.h>
  25 #include <linux/wait.h>
  26 #include <linux/tty.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/ppp_defs.h>
  29 #include <linux/if_ppp.h>
  30 #include <linux/skbuff.h>
  31 #include <linux/proc_fs.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/poll.h>
  34 #include <linux/capi.h>
  35 #include <linux/kernelcapi.h>
  36 #include <linux/init.h>
  37 #include <linux/device.h>
  38 #include <linux/moduleparam.h>
  39 #include <linux/isdn/capiutil.h>
  40 #include <linux/isdn/capicmd.h>
  41
  42 #include "capifs.h"
  43
  44 MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
  45 MODULE_AUTHOR("Carsten Paeth");
  46 MODULE_LICENSE("GPL");
  47
  48 #undef _DEBUG_REFCOUNT          /* alloc/free and open/close debug */
  49 #undef _DEBUG_TTYFUNCS          /* call to tty_driver */
  50 #undef _DEBUG_DATAFLOW          /* data flow */
  51
  52 /* -------- driver information -------------------------------------- */
  53
  54 static struct class *capi_class;
  55 static int capi_major = 68;             /* allocated */
  56
  57 module_param_named(major, capi_major, uint, 0);
  58
  59 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
  60 #define CAPINC_NR_PORTS         32
  61 #define CAPINC_MAX_PORTS        256
  62
  63 static int capi_ttyminors = CAPINC_NR_PORTS;
  64
  65 module_param_named(ttyminors, capi_ttyminors, uint, 0);
  66 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
  67
  68 /* -------- defines ------------------------------------------------- */
  69
  70 #define CAPINC_MAX_RECVQUEUE    10
  71 #define CAPINC_MAX_SENDQUEUE    10
  72 #define CAPI_MAX_BLKSIZE        2048
  73
  74 /* -------- data structures ----------------------------------------- */
  75
  76 struct capidev;
  77 struct capincci;
  78 struct capiminor;
  79
  80 struct datahandle_queue {
  81         struct list_head        list;
  82         u16                     datahandle;
  83 };
  84
  85 struct capiminor {
  86         struct kref kref;
  87
  88         unsigned int      minor;
  89         struct dentry *capifs_dentry;
  90
  91         struct capi20_appl *ap;
  92         u32              ncci;
  93         u16              datahandle;
  94         u16              msgid;
  95
  96         struct tty_port port;
  97         int                ttyinstop;
  98         int                ttyoutstop;
  99         struct sk_buff    *ttyskb;
 100         atomic_t           ttyopencount;
 101
 102         struct sk_buff_head inqueue;
 103         int                 inbytes;
 104         struct sk_buff_head outqueue;
 105         int                 outbytes;
 106
 107         /* transmit path */
 108         struct list_head ackqueue;
 109         int nack;
 110         spinlock_t ackqlock;
 111 };
 112
 113 /* FIXME: The following lock is a sledgehammer-workaround to a
 114  * locking issue with the capiminor (and maybe other) data structure(s).
 115  * Access to this data is done in a racy way and crashes the machine with
 116  * a FritzCard DSL driver; sooner or later. This is a workaround
 117  * which trades scalability vs stability, so it doesn't crash the kernel anymore.
 118  * The correct (and scalable) fix for the issue seems to require
 119  * an API change to the drivers... . */
 120 static DEFINE_SPINLOCK(workaround_lock);
 121
 122 struct capincci {
 123         struct list_head list;
 124         u32              ncci;
 125         struct capidev  *cdev;
 126 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 127         struct capiminor *minorp;
 128 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 129 };
 130
 131 struct capidev {
 132         struct list_head list;
 133         struct capi20_appl ap;
 134         u16             errcode;
 135         unsigned        userflags;
 136
 137         struct sk_buff_head recvqueue;
 138         wait_queue_head_t recvwait;
 139
 140         struct list_head nccis;
 141
 142         struct mutex lock;
 143 };
 144
 145 /* -------- global variables ---------------------------------------- */
 146
 147 static DEFINE_MUTEX(capidev_list_lock);
 148 static LIST_HEAD(capidev_list);
 149
 150 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 151
 152 static DEFINE_SPINLOCK(capiminors_lock);
 153 static struct capiminor **capiminors;
 154
 155 static struct tty_driver *capinc_tty_driver;
 156
 157 /* -------- datahandles --------------------------------------------- */
 158
 159 static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
 160 {
 161         struct datahandle_queue *n;
 162         unsigned long flags;
 163
 164         n = kmalloc(sizeof(*n), GFP_ATOMIC);
 165         if (unlikely(!n)) {
 166                 printk(KERN_ERR "capi: alloc datahandle failed\n");
 167                 return -1;
 168         }
 169         n->datahandle = datahandle;
 170         INIT_LIST_HEAD(&n->list);
 171         spin_lock_irqsave(&mp->ackqlock, flags);
 172         list_add_tail(&n->list, &mp->ackqueue);
 173         mp->nack++;
 174         spin_unlock_irqrestore(&mp->ackqlock, flags);
 175         return 0;
 176 }
 177
 178 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
 179 {
 180         struct datahandle_queue *p, *tmp;
 181         unsigned long flags;
 182
 183         spin_lock_irqsave(&mp->ackqlock, flags);
 184         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 185                 if (p->datahandle == datahandle) {
 186                         list_del(&p->list);
 187                         kfree(p);
 188                         mp->nack--;
 189                         spin_unlock_irqrestore(&mp->ackqlock, flags);
 190                         return 0;
 191                 }
 192         }
 193         spin_unlock_irqrestore(&mp->ackqlock, flags);
 194         return -1;
 195 }
 196
 197 static void capiminor_del_all_ack(struct capiminor *mp)
 198 {
 199         struct datahandle_queue *p, *tmp;
 200         unsigned long flags;
 201
 202         spin_lock_irqsave(&mp->ackqlock, flags);
 203         list_for_each_entry_safe(p, tmp, &mp->ackqueue, list) {
 204                 list_del(&p->list);
 205                 kfree(p);
 206                 mp->nack--;
 207         }
 208         spin_unlock_irqrestore(&mp->ackqlock, flags);
 209 }
 210
 211
 212 /* -------- struct capiminor ---------------------------------------- */
 213
 214 static const struct tty_port_operations capiminor_port_ops; /* we have none */
 215
 216 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
 217 {
 218         struct capiminor *mp;
 219         struct device *dev;
 220         unsigned int minor;
 221
 222         mp = kzalloc(sizeof(*mp), GFP_KERNEL);
 223         if (!mp) {
 224                 printk(KERN_ERR "capi: can't alloc capiminor\n");
 225                 return NULL;
 226         }
 227
 228         kref_init(&mp->kref);
 229
 230         mp->ap = ap;
 231         mp->ncci = ncci;
 232         mp->msgid = 0;
 233         atomic_set(&mp->ttyopencount,0);
 234         INIT_LIST_HEAD(&mp->ackqueue);
 235         spin_lock_init(&mp->ackqlock);
 236
 237         skb_queue_head_init(&mp->inqueue);
 238         skb_queue_head_init(&mp->outqueue);
 239
 240         tty_port_init(&mp->port);
 241         mp->port.ops = &capiminor_port_ops;
 242
 243         /* Allocate the least unused minor number. */
 244         spin_lock(&capiminors_lock);
 245         for (minor = 0; minor < capi_ttyminors; minor++)
 246                 if (!capiminors[minor]) {
 247                         capiminors[minor] = mp;
 248                         break;
 249                 }
 250         spin_unlock(&capiminors_lock);
 251
 252         if (minor == capi_ttyminors) {
 253                 printk(KERN_NOTICE "capi: out of minors\n");
 254                 goto err_out1;
 255         }
 256
 257         mp->minor = minor;
 258
 259         dev = tty_register_device(capinc_tty_driver, minor, NULL);
 260         if (IS_ERR(dev))
 261                 goto err_out2;
 262
 263         return mp;
 264
 265 err_out2:
 266         spin_lock(&capiminors_lock);
 267         capiminors[minor] = NULL;
 268         spin_unlock(&capiminors_lock);
 269
 270 err_out1:
 271         kfree(mp);
 272         return NULL;
 273 }
 274
 275 static void capiminor_destroy(struct kref *kref)
 276 {
 277         struct capiminor *mp = container_of(kref, struct capiminor, kref);
 278
 279         kfree_skb(mp->ttyskb);
 280         skb_queue_purge(&mp->inqueue);
 281         skb_queue_purge(&mp->outqueue);
 282         capiminor_del_all_ack(mp);
 283         kfree(mp);
 284 }
 285
 286 static struct capiminor *capiminor_get(unsigned int minor)
 287 {
 288         struct capiminor *mp;
 289
 290         spin_lock(&capiminors_lock);
 291         mp = capiminors[minor];
 292         if (mp)
 293                 kref_get(&mp->kref);
 294         spin_unlock(&capiminors_lock);
 295
 296         return mp;
 297 }
 298
 299 static inline void capiminor_put(struct capiminor *mp)
 300 {
 301         kref_put(&mp->kref, capiminor_destroy);
 302 }
 303
 304 static void capiminor_free(struct capiminor *mp)
 305 {
 306         tty_unregister_device(capinc_tty_driver, mp->minor);
 307
 308         spin_lock(&capiminors_lock);
 309         capiminors[mp->minor] = NULL;
 310         spin_unlock(&capiminors_lock);
 311
 312         capiminor_put(mp);
 313 }
 314
 315 /* -------- struct capincci ----------------------------------------- */
 316
 317 static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
 318 {
 319         struct capiminor *mp;
 320         dev_t device;
 321
 322         if (!(cdev->userflags & CAPIFLAG_HIGHJACKING))
 323                 return;
 324
 325         mp = np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
 326         if (mp) {
 327                 device = MKDEV(capinc_tty_driver->major, mp->minor);
 328                 mp->capifs_dentry = capifs_new_ncci(mp->minor, device);
 329         }
 330 }
 331
 332 static void capincci_free_minor(struct capincci *np)
 333 {
 334         struct capiminor *mp = np->minorp;
 335         struct tty_struct *tty;
 336
 337         if (mp) {
 338                 capifs_free_ncci(mp->capifs_dentry);
 339
 340                 tty = tty_port_tty_get(&mp->port);
 341                 if (tty) {
 342                         tty_vhangup(tty);
 343                         tty_kref_put(tty);
 344                 }
 345
 346                 capiminor_free(mp);
 347         }
 348 }
 349
 350 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 351 {
 352         struct capiminor *mp = np->minorp;
 353
 354         return mp ? atomic_read(&mp->ttyopencount) : 0;
 355 }
 356
 357 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 358
 359 static inline void
 360 capincci_alloc_minor(struct capidev *cdev, struct capincci *np) { }
 361 static inline void capincci_free_minor(struct capincci *np) { }
 362
 363 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 364 {
 365         return 0;
 366 }
 367
 368 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
 369
 370 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
 371 {
 372         struct capincci *np;
 373
 374         np = kzalloc(sizeof(*np), GFP_KERNEL);
 375         if (!np)
 376                 return NULL;
 377         np->ncci = ncci;
 378         np->cdev = cdev;
 379
 380         capincci_alloc_minor(cdev, np);
 381
 382         list_add_tail(&np->list, &cdev->nccis);
 383
 384         return np;
 385 }
 386
 387 static void capincci_free(struct capidev *cdev, u32 ncci)
 388 {
 389         struct capincci *np, *tmp;
 390
 391         list_for_each_entry_safe(np, tmp, &cdev->nccis, list)
 392                 if (ncci == 0xffffffff || np->ncci == ncci) {
 393                         capincci_free_minor(np);
 394                         list_del(&np->list);
 395                         kfree(np);
 396                 }
 397 }
 398
 399 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
 400 {
 401         struct capincci *np;
 402
 403         list_for_each_entry(np, &cdev->nccis, list)
 404                 if (np->ncci == ncci)
 405                         return np;
 406         return NULL;
 407 }
 408
 409 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 410 /* -------- handle data queue --------------------------------------- */
 411
 412 static struct sk_buff *
 413 gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
 414 {
 415         struct sk_buff *nskb;
 416         nskb = alloc_skb(CAPI_DATA_B3_RESP_LEN, GFP_ATOMIC);
 417         if (nskb) {
 418                 u16 datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4+4+2);
 419                 unsigned char *s = skb_put(nskb, CAPI_DATA_B3_RESP_LEN);
 420                 capimsg_setu16(s, 0, CAPI_DATA_B3_RESP_LEN);
 421                 capimsg_setu16(s, 2, mp->ap->applid);
 422                 capimsg_setu8 (s, 4, CAPI_DATA_B3);
 423                 capimsg_setu8 (s, 5, CAPI_RESP);
 424                 capimsg_setu16(s, 6, mp->msgid++);
 425                 capimsg_setu32(s, 8, mp->ncci);
 426                 capimsg_setu16(s, 12, datahandle);
 427         }
 428         return nskb;
 429 }
 430
 431 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
 432 {
 433         struct tty_struct *tty;
 434         struct sk_buff *nskb;
 435         int datalen;
 436         u16 errcode, datahandle;
 437         struct tty_ldisc *ld;
 438         int ret = -1;
 439
 440         datalen = skb->len - CAPIMSG_LEN(skb->data);
 441
 442         tty = tty_port_tty_get(&mp->port);
 443         if (!tty) {
 444 #ifdef _DEBUG_DATAFLOW
 445                 printk(KERN_DEBUG "capi: currently no receiver\n");
 446 #endif
 447                 return -1;
 448         }
 449
 450         ld = tty_ldisc_ref(tty);
 451         if (!ld)
 452                 goto out1;
 453
 454         if (ld->ops->receive_buf == NULL) {
 455 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 456                 printk(KERN_DEBUG "capi: ldisc has no receive_buf function\n");
 457 #endif
 458                 goto out2;
 459         }
 460         if (mp->ttyinstop) {
 461 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 462                 printk(KERN_DEBUG "capi: recv tty throttled\n");
 463 #endif
 464                 goto out2;
 465         }
 466         if (tty->receive_room < datalen) {
 467 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 468                 printk(KERN_DEBUG "capi: no room in tty\n");
 469 #endif
 470                 goto out2;
 471         }
 472         if ((nskb = gen_data_b3_resp_for(mp, skb)) == NULL) {
 473                 printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
 474                 goto out2;
 475         }
 476         datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4);
 477         errcode = capi20_put_message(mp->ap, nskb);
 478         if (errcode != CAPI_NOERROR) {
 479                 printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
 480                                 errcode);
 481                 kfree_skb(nskb);
 482                 goto out2;
 483         }
 484         (void)skb_pull(skb, CAPIMSG_LEN(skb->data));
 485 #ifdef _DEBUG_DATAFLOW
 486         printk(KERN_DEBUG "capi: DATA_B3_RESP %u len=%d => ldisc\n",
 487                                 datahandle, skb->len);
 488 #endif
 489         ld->ops->receive_buf(tty, skb->data, NULL, skb->len);
 490         kfree_skb(skb);
 491         ret = 0;
 492 out2:
 493         tty_ldisc_deref(ld);
 494 out1:
 495         tty_kref_put(tty);
 496         return ret;
 497 }
 498
 499 static void handle_minor_recv(struct capiminor *mp)
 500 {
 501         struct sk_buff *skb;
 502         while ((skb = skb_dequeue(&mp->inqueue)) != NULL) {
 503                 unsigned int len = skb->len;
 504                 mp->inbytes -= len;
 505                 if (handle_recv_skb(mp, skb) < 0) {
 506                         skb_queue_head(&mp->inqueue, skb);
 507                         mp->inbytes += len;
 508                         return;
 509                 }
 510         }
 511 }
 512
 513 static int handle_minor_send(struct capiminor *mp)
 514 {
 515         struct tty_struct *tty;
 516         struct sk_buff *skb;
 517         u16 len;
 518         int count = 0;
 519         u16 errcode;
 520         u16 datahandle;
 521
 522         tty = tty_port_tty_get(&mp->port);
 523         if (!tty)
 524                 return 0;
 525
 526         if (mp->ttyoutstop) {
 527 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 528                 printk(KERN_DEBUG "capi: send: tty stopped\n");
 529 #endif
 530                 tty_kref_put(tty);
 531                 return 0;
 532         }
 533
 534         while ((skb = skb_dequeue(&mp->outqueue)) != NULL) {
 535                 datahandle = mp->datahandle;
 536                 len = (u16)skb->len;
 537                 skb_push(skb, CAPI_DATA_B3_REQ_LEN);
 538                 memset(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 539                 capimsg_setu16(skb->data, 0, CAPI_DATA_B3_REQ_LEN);
 540                 capimsg_setu16(skb->data, 2, mp->ap->applid);
 541                 capimsg_setu8 (skb->data, 4, CAPI_DATA_B3);
 542                 capimsg_setu8 (skb->data, 5, CAPI_REQ);
 543                 capimsg_setu16(skb->data, 6, mp->msgid++);
 544                 capimsg_setu32(skb->data, 8, mp->ncci); /* NCCI */
 545                 capimsg_setu32(skb->data, 12, (u32)(long)skb->data);/* Data32 */
 546                 capimsg_setu16(skb->data, 16, len);     /* Data length */
 547                 capimsg_setu16(skb->data, 18, datahandle);
 548                 capimsg_setu16(skb->data, 20, 0);       /* Flags */
 549
 550                 if (capiminor_add_ack(mp, datahandle) < 0) {
 551                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 552                         skb_queue_head(&mp->outqueue, skb);
 553                         tty_kref_put(tty);
 554                         return count;
 555                 }
 556                 errcode = capi20_put_message(mp->ap, skb);
 557                 if (errcode == CAPI_NOERROR) {
 558                         mp->datahandle++;
 559                         count++;
 560                         mp->outbytes -= len;
 561 #ifdef _DEBUG_DATAFLOW
 562                         printk(KERN_DEBUG "capi: DATA_B3_REQ %u len=%u\n",
 563                                                         datahandle, len);
 564 #endif
 565                         continue;
 566                 }
 567                 capiminor_del_ack(mp, datahandle);
 568
 569                 if (errcode == CAPI_SENDQUEUEFULL) {
 570                         skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 571                         skb_queue_head(&mp->outqueue, skb);
 572                         break;
 573                 }
 574
 575                 /* ups, drop packet */
 576                 printk(KERN_ERR "capi: put_message = %x\n", errcode);
 577                 mp->outbytes -= len;
 578                 kfree_skb(skb);
 579         }
 580         tty_kref_put(tty);
 581         return count;
 582 }
 583
 584 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 585 /* -------- function called by lower level -------------------------- */
 586
 587 static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
 588 {
 589         struct capidev *cdev = ap->private;
 590 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 591         struct tty_struct *tty;
 592         struct capiminor *mp;
 593         u16 datahandle;
 594 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 595         struct capincci *np;
 596         unsigned long flags;
 597
 598         mutex_lock(&cdev->lock);
 599
 600         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
 601                 u16 info = CAPIMSG_U16(skb->data, 12); // Info field
 602                 if ((info & 0xff00) == 0)
 603                         capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 604         }
 605         if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
 606                 capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
 607
 608         spin_lock_irqsave(&workaround_lock, flags);
 609         if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
 610                 skb_queue_tail(&cdev->recvqueue, skb);
 611                 wake_up_interruptible(&cdev->recvwait);
 612                 goto unlock_out;
 613         }
 614
 615         np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
 616         if (!np) {
 617                 printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
 618                 skb_queue_tail(&cdev->recvqueue, skb);
 619                 wake_up_interruptible(&cdev->recvwait);
 620                 goto unlock_out;
 621         }
 622
 623 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
 624         skb_queue_tail(&cdev->recvqueue, skb);
 625         wake_up_interruptible(&cdev->recvwait);
 626
 627 #else /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 628
 629         mp = np->minorp;
 630         if (!mp) {
 631                 skb_queue_tail(&cdev->recvqueue, skb);
 632                 wake_up_interruptible(&cdev->recvwait);
 633                 goto unlock_out;
 634         }
 635         if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
 636                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+4+2);
 637 #ifdef _DEBUG_DATAFLOW
 638                 printk(KERN_DEBUG "capi_signal: DATA_B3_IND %u len=%d\n",
 639                                 datahandle, skb->len-CAPIMSG_LEN(skb->data));
 640 #endif
 641                 skb_queue_tail(&mp->inqueue, skb);
 642                 mp->inbytes += skb->len;
 643                 handle_minor_recv(mp);
 644
 645         } else if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_CONF) {
 646
 647                 datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4);
 648 #ifdef _DEBUG_DATAFLOW
 649                 printk(KERN_DEBUG "capi_signal: DATA_B3_CONF %u 0x%x\n",
 650                                 datahandle,
 651                                 CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+2));
 652 #endif
 653                 kfree_skb(skb);
 654                 (void)capiminor_del_ack(mp, datahandle);
 655                 tty = tty_port_tty_get(&mp->port);
 656                 if (tty) {
 657                         tty_wakeup(tty);
 658                         tty_kref_put(tty);
 659                 }
 660                 (void)handle_minor_send(mp);
 661
 662         } else {
 663                 /* ups, let capi application handle it :-) */
 664                 skb_queue_tail(&cdev->recvqueue, skb);
 665                 wake_up_interruptible(&cdev->recvwait);
 666         }
 667 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 668
 669 unlock_out:
 670         spin_unlock_irqrestore(&workaround_lock, flags);
 671         mutex_unlock(&cdev->lock);
 672 }
 673
 674 /* -------- file_operations for capidev ----------------------------- */
 675
 676 static ssize_t
 677 capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 678 {
 679         struct capidev *cdev = (struct capidev *)file->private_data;
 680         struct sk_buff *skb;
 681         size_t copied;
 682         int err;
 683
 684         if (!cdev->ap.applid)
 685                 return -ENODEV;
 686
 687         skb = skb_dequeue(&cdev->recvqueue);
 688         if (!skb) {
 689                 if (file->f_flags & O_NONBLOCK)
 690                         return -EAGAIN;
 691                 err = wait_event_interruptible(cdev->recvwait,
 692                                 (skb = skb_dequeue(&cdev->recvqueue)));
 693                 if (err)
 694                         return err;
 695         }
 696         if (skb->len > count) {
 697                 skb_queue_head(&cdev->recvqueue, skb);
 698                 return -EMSGSIZE;
 699         }
 700         if (copy_to_user(buf, skb->data, skb->len)) {
 701                 skb_queue_head(&cdev->recvqueue, skb);
 702                 return -EFAULT;
 703         }
 704         copied = skb->len;
 705
 706         kfree_skb(skb);
 707
 708         return copied;
 709 }
 710
 711 static ssize_t
 712 capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 713 {
 714         struct capidev *cdev = (struct capidev *)file->private_data;
 715         struct sk_buff *skb;
 716         u16 mlen;
 717
 718         if (!cdev->ap.applid)
 719                 return -ENODEV;
 720
 721         skb = alloc_skb(count, GFP_USER);
 722         if (!skb)
 723                 return -ENOMEM;
 724
 725         if (copy_from_user(skb_put(skb, count), buf, count)) {
 726                 kfree_skb(skb);
 727                 return -EFAULT;
 728         }
 729         mlen = CAPIMSG_LEN(skb->data);
 730         if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
 731                 if ((size_t)(mlen + CAPIMSG_DATALEN(skb->data)) != count) {
 732                         kfree_skb(skb);
 733                         return -EINVAL;
 734                 }
 735         } else {
 736                 if (mlen != count) {
 737                         kfree_skb(skb);
 738                         return -EINVAL;
 739                 }
 740         }
 741         CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
 742
 743         if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
 744                 mutex_lock(&cdev->lock);
 745                 capincci_free(cdev, CAPIMSG_NCCI(skb->data));
 746                 mutex_unlock(&cdev->lock);
 747         }
 748
 749         cdev->errcode = capi20_put_message(&cdev->ap, skb);
 750
 751         if (cdev->errcode) {
 752                 kfree_skb(skb);
 753                 return -EIO;
 754         }
 755         return count;
 756 }
 757
 758 static unsigned int
 759 capi_poll(struct file *file, poll_table * wait)
 760 {
 761         struct capidev *cdev = (struct capidev *)file->private_data;
 762         unsigned int mask = 0;
 763
 764         if (!cdev->ap.applid)
 765                 return POLLERR;
 766
 767         poll_wait(file, &(cdev->recvwait), wait);
 768         mask = POLLOUT | POLLWRNORM;
 769         if (!skb_queue_empty(&cdev->recvqueue))
 770                 mask |= POLLIN | POLLRDNORM;
 771         return mask;
 772 }
 773
 774 static int
 775 capi_ioctl(struct inode *inode, struct file *file,
 776            unsigned int cmd, unsigned long arg)
 777 {
 778         struct capidev *cdev = file->private_data;
 779         capi_ioctl_struct data;
 780         int retval = -EINVAL;
 781         void __user *argp = (void __user *)arg;
 782
 783         switch (cmd) {
 784         case CAPI_REGISTER:
 785                 mutex_lock(&cdev->lock);
 786
 787                 if (cdev->ap.applid) {
 788                         retval = -EEXIST;
 789                         goto register_out;
 790                 }
 791                 if (copy_from_user(&cdev->ap.rparam, argp,
 792                                    sizeof(struct capi_register_params))) {
 793                         retval = -EFAULT;
 794                         goto register_out;
 795                 }
 796                 cdev->ap.private = cdev;
 797                 cdev->ap.recv_message = capi_recv_message;
 798                 cdev->errcode = capi20_register(&cdev->ap);
 799                 retval = (int)cdev->ap.applid;
 800                 if (cdev->errcode) {
 801                         cdev->ap.applid = 0;
 802                         retval = -EIO;
 803                 }
 804
 805 register_out:
 806                 mutex_unlock(&cdev->lock);
 807                 return retval;
 808
 809         case CAPI_GET_VERSION:
 810                 {
 811                         if (copy_from_user(&data.contr, argp,
 812                                                 sizeof(data.contr)))
 813                                 return -EFAULT;
 814                         cdev->errcode = capi20_get_version(data.contr, &data.version);
 815                         if (cdev->errcode)
 816                                 return -EIO;
 817                         if (copy_to_user(argp, &data.version,
 818                                          sizeof(data.version)))
 819                                 return -EFAULT;
 820                 }
 821                 return 0;
 822
 823         case CAPI_GET_SERIAL:
 824                 {
 825                         if (copy_from_user(&data.contr, argp,
 826                                            sizeof(data.contr)))
 827                                 return -EFAULT;
 828                         cdev->errcode = capi20_get_serial (data.contr, data.serial);
 829                         if (cdev->errcode)
 830                                 return -EIO;
 831                         if (copy_to_user(argp, data.serial,
 832                                          sizeof(data.serial)))
 833                                 return -EFAULT;
 834                 }
 835                 return 0;
 836         case CAPI_GET_PROFILE:
 837                 {
 838                         if (copy_from_user(&data.contr, argp,
 839                                            sizeof(data.contr)))
 840                                 return -EFAULT;
 841
 842                         if (data.contr == 0) {
 843                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 844                                 if (cdev->errcode)
 845                                         return -EIO;
 846
 847                                 retval = copy_to_user(argp,
 848                                       &data.profile.ncontroller,
 849                                        sizeof(data.profile.ncontroller));
 850
 851                         } else {
 852                                 cdev->errcode = capi20_get_profile(data.contr, &data.profile);
 853                                 if (cdev->errcode)
 854                                         return -EIO;
 855
 856                                 retval = copy_to_user(argp, &data.profile,
 857                                                    sizeof(data.profile));
 858                         }
 859                         if (retval)
 860                                 return -EFAULT;
 861                 }
 862                 return 0;
 863
 864         case CAPI_GET_MANUFACTURER:
 865                 {
 866                         if (copy_from_user(&data.contr, argp,
 867                                            sizeof(data.contr)))
 868                                 return -EFAULT;
 869                         cdev->errcode = capi20_get_manufacturer(data.contr, data.manufacturer);
 870                         if (cdev->errcode)
 871                                 return -EIO;
 872
 873                         if (copy_to_user(argp, data.manufacturer,
 874                                          sizeof(data.manufacturer)))
 875                                 return -EFAULT;
 876
 877                 }
 878                 return 0;
 879         case CAPI_GET_ERRCODE:
 880                 data.errcode = cdev->errcode;
 881                 cdev->errcode = CAPI_NOERROR;
 882                 if (arg) {
 883                         if (copy_to_user(argp, &data.errcode,
 884                                          sizeof(data.errcode)))
 885                                 return -EFAULT;
 886                 }
 887                 return data.errcode;
 888
 889         case CAPI_INSTALLED:
 890                 if (capi20_isinstalled() == CAPI_NOERROR)
 891                         return 0;
 892                 return -ENXIO;
 893
 894         case CAPI_MANUFACTURER_CMD:
 895                 {
 896                         struct capi_manufacturer_cmd mcmd;
 897                         if (!capable(CAP_SYS_ADMIN))
 898                                 return -EPERM;
 899                         if (copy_from_user(&mcmd, argp, sizeof(mcmd)))
 900                                 return -EFAULT;
 901                         return capi20_manufacturer(mcmd.cmd, mcmd.data);
 902                 }
 903                 return 0;
 904
 905         case CAPI_SET_FLAGS:
 906         case CAPI_CLR_FLAGS: {
 907                 unsigned userflags;
 908
 909                 if (copy_from_user(&userflags, argp, sizeof(userflags)))
 910                         return -EFAULT;
 911
 912                 mutex_lock(&cdev->lock);
 913                 if (cmd == CAPI_SET_FLAGS)
 914                         cdev->userflags |= userflags;
 915                 else
 916                         cdev->userflags &= ~userflags;
 917                 mutex_unlock(&cdev->lock);
 918                 return 0;
 919         }
 920         case CAPI_GET_FLAGS:
 921                 if (copy_to_user(argp, &cdev->userflags,
 922                                  sizeof(cdev->userflags)))
 923                         return -EFAULT;
 924                 return 0;
 925
 926         case CAPI_NCCI_OPENCOUNT: {
 927                 struct capincci *nccip;
 928                 unsigned ncci;
 929                 int count = 0;
 930
 931                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 932                         return -EFAULT;
 933
 934                 mutex_lock(&cdev->lock);
 935                 nccip = capincci_find(cdev, (u32)ncci);
 936                 if (nccip)
 937                         count = capincci_minor_opencount(nccip);
 938                 mutex_unlock(&cdev->lock);
 939                 return count;
 940         }
 941
 942 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 943         case CAPI_NCCI_GETUNIT: {
 944                 struct capincci *nccip;
 945                 struct capiminor *mp;
 946                 unsigned ncci;
 947                 int unit = -ESRCH;
 948
 949                 if (copy_from_user(&ncci, argp, sizeof(ncci)))
 950                         return -EFAULT;
 951
 952                 mutex_lock(&cdev->lock);
 953                 nccip = capincci_find(cdev, (u32)ncci);
 954                 if (nccip) {
 955                         mp = nccip->minorp;
 956                         if (mp)
 957                                 unit = mp->minor;
 958                 }
 959                 mutex_unlock(&cdev->lock);
 960                 return unit;
 961         }
 962 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 963
 964         default:
 965                 return -EINVAL;
 966         }
 967 }
 968
 969 static int capi_open(struct inode *inode, struct file *file)
 970 {
 971         struct capidev *cdev;
 972
 973         cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
 974         if (!cdev)
 975                 return -ENOMEM;
 976
 977         mutex_init(&cdev->lock);
 978         skb_queue_head_init(&cdev->recvqueue);
 979         init_waitqueue_head(&cdev->recvwait);
 980         INIT_LIST_HEAD(&cdev->nccis);
 981         file->private_data = cdev;
 982
 983         mutex_lock(&capidev_list_lock);
 984         list_add_tail(&cdev->list, &capidev_list);
 985         mutex_unlock(&capidev_list_lock);
 986
 987         return nonseekable_open(inode, file);
 988 }
 989
 990 static int capi_release(struct inode *inode, struct file *file)
 991 {
 992         struct capidev *cdev = file->private_data;
 993
 994         mutex_lock(&capidev_list_lock);
 995         list_del(&cdev->list);
 996         mutex_unlock(&capidev_list_lock);
 997
 998         if (cdev->ap.applid)
 999                 capi20_release(&cdev->ap);
1000         skb_queue_purge(&cdev->recvqueue);
1001         capincci_free(cdev, 0xffffffff);
1002
1003         kfree(cdev);
1004         return 0;
1005 }
1006
1007 static const struct file_operations capi_fops =
1008 {
1009         .owner          = THIS_MODULE,
1010         .llseek         = no_llseek,
1011         .read           = capi_read,
1012         .write          = capi_write,
1013         .poll           = capi_poll,
1014         .ioctl          = capi_ioctl,
1015         .open           = capi_open,
1016         .release        = capi_release,
1017 };
1018
1019 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
1020 /* -------- tty_operations for capincci ----------------------------- */
1021
1022 static int
1023 capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
1024 {
1025         int idx = tty->index;
1026         struct capiminor *mp = capiminor_get(idx);
1027         int ret = tty_init_termios(tty);
1028
1029         if (ret == 0) {
1030                 tty_driver_kref_get(driver);
1031                 tty->count++;
1032                 tty->driver_data = mp;
1033                 driver->ttys[idx] = tty;
1034         } else
1035                 capiminor_put(mp);
1036         return ret;
1037 }
1038
1039 static void capinc_tty_cleanup(struct tty_struct *tty)
1040 {
1041         struct capiminor *mp = tty->driver_data;
1042         tty->driver_data = NULL;
1043         capiminor_put(mp);
1044 }
1045
1046 static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
1047 {
1048         struct capiminor *mp = tty->driver_data;
1049         unsigned long flags;
1050         int err;
1051
1052         err = tty_port_open(&mp->port, tty, filp);
1053         if (err)
1054                 return err;
1055
1056         spin_lock_irqsave(&workaround_lock, flags);
1057         atomic_inc(&mp->ttyopencount);
1058 #ifdef _DEBUG_REFCOUNT
1059         printk(KERN_DEBUG "capinc_tty_open ocount=%d\n", atomic_read(&mp->ttyopencount));
1060 #endif
1061         handle_minor_recv(mp);
1062         spin_unlock_irqrestore(&workaround_lock, flags);
1063         return 0;
1064 }
1065
1066 static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
1067 {
1068         struct capiminor *mp = tty->driver_data;
1069
1070                 if (atomic_dec_and_test(&mp->ttyopencount)) {
1071 #ifdef _DEBUG_REFCOUNT
1072                         printk(KERN_DEBUG "capinc_tty_close lastclose\n");
1073 #endif
1074                 }
1075 #ifdef _DEBUG_REFCOUNT
1076                 printk(KERN_DEBUG "capinc_tty_close ocount=%d\n", atomic_read(&mp->ttyopencount));
1077 #endif
1078
1079 #ifdef _DEBUG_REFCOUNT
1080         printk(KERN_DEBUG "capinc_tty_close\n");
1081 #endif
1082         tty_port_close(&mp->port, tty, filp);
1083 }
1084
1085 static int capinc_tty_write(struct tty_struct *tty,
1086                             const unsigned char *buf, int count)
1087 {
1088         struct capiminor *mp = tty->driver_data;
1089         struct sk_buff *skb;
1090         unsigned long flags;
1091
1092 #ifdef _DEBUG_TTYFUNCS
1093         printk(KERN_DEBUG "capinc_tty_write(count=%d)\n", count);
1094 #endif
1095
1096         spin_lock_irqsave(&workaround_lock, flags);
1097         skb = mp->ttyskb;
1098         if (skb) {
1099                 mp->ttyskb = NULL;
1100                 skb_queue_tail(&mp->outqueue, skb);
1101                 mp->outbytes += skb->len;
1102         }
1103
1104         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+count, GFP_ATOMIC);
1105         if (!skb) {
1106                 printk(KERN_ERR "capinc_tty_write: alloc_skb failed\n");
1107                 spin_unlock_irqrestore(&workaround_lock, flags);
1108                 return -ENOMEM;
1109         }
1110
1111         skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1112         memcpy(skb_put(skb, count), buf, count);
1113
1114         skb_queue_tail(&mp->outqueue, skb);
1115         mp->outbytes += skb->len;
1116         (void)handle_minor_send(mp);
1117         (void)handle_minor_recv(mp);
1118         spin_unlock_irqrestore(&workaround_lock, flags);
1119         return count;
1120 }
1121
1122 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
1123 {
1124         struct capiminor *mp = tty->driver_data;
1125         struct sk_buff *skb;
1126         unsigned long flags;
1127         int ret = 1;
1128
1129 #ifdef _DEBUG_TTYFUNCS
1130         printk(KERN_DEBUG "capinc_put_char(%u)\n", ch);
1131 #endif
1132
1133         spin_lock_irqsave(&workaround_lock, flags);
1134         skb = mp->ttyskb;
1135         if (skb) {
1136                 if (skb_tailroom(skb) > 0) {
1137                         *(skb_put(skb, 1)) = ch;
1138                         spin_unlock_irqrestore(&workaround_lock, flags);
1139                         return 1;
1140                 }
1141                 mp->ttyskb = NULL;
1142                 skb_queue_tail(&mp->outqueue, skb);
1143                 mp->outbytes += skb->len;
1144                 (void)handle_minor_send(mp);
1145         }
1146         skb = alloc_skb(CAPI_DATA_B3_REQ_LEN+CAPI_MAX_BLKSIZE, GFP_ATOMIC);
1147         if (skb) {
1148                 skb_reserve(skb, CAPI_DATA_B3_REQ_LEN);
1149                 *(skb_put(skb, 1)) = ch;
1150                 mp->ttyskb = skb;
1151         } else {
1152                 printk(KERN_ERR "capinc_put_char: char %u lost\n", ch);
1153                 ret = 0;
1154         }
1155         spin_unlock_irqrestore(&workaround_lock, flags);
1156         return ret;
1157 }
1158
1159 static void capinc_tty_flush_chars(struct tty_struct *tty)
1160 {
1161         struct capiminor *mp = tty->driver_data;
1162         struct sk_buff *skb;
1163         unsigned long flags;
1164
1165 #ifdef _DEBUG_TTYFUNCS
1166         printk(KERN_DEBUG "capinc_tty_flush_chars\n");
1167 #endif
1168
1169         spin_lock_irqsave(&workaround_lock, flags);
1170         skb = mp->ttyskb;
1171         if (skb) {
1172                 mp->ttyskb = NULL;
1173                 skb_queue_tail(&mp->outqueue, skb);
1174                 mp->outbytes += skb->len;
1175                 (void)handle_minor_send(mp);
1176         }
1177         (void)handle_minor_recv(mp);
1178         spin_unlock_irqrestore(&workaround_lock, flags);
1179 }
1180
1181 static int capinc_tty_write_room(struct tty_struct *tty)
1182 {
1183         struct capiminor *mp = tty->driver_data;
1184         int room;
1185
1186         room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
1187         room *= CAPI_MAX_BLKSIZE;
1188 #ifdef _DEBUG_TTYFUNCS
1189         printk(KERN_DEBUG "capinc_tty_write_room = %d\n", room);
1190 #endif
1191         return room;
1192 }
1193
1194 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
1195 {
1196         struct capiminor *mp = tty->driver_data;
1197
1198 #ifdef _DEBUG_TTYFUNCS
1199         printk(KERN_DEBUG "capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
1200                         mp->outbytes, mp->nack,
1201                         skb_queue_len(&mp->outqueue),
1202                         skb_queue_len(&mp->inqueue));
1203 #endif
1204         return mp->outbytes;
1205 }
1206
1207 static int capinc_tty_ioctl(struct tty_struct *tty, struct file * file,
1208                     unsigned int cmd, unsigned long arg)
1209 {
1210         int error = 0;
1211         switch (cmd) {
1212         default:
1213                 error = n_tty_ioctl_helper(tty, file, cmd, arg);
1214                 break;
1215         }
1216         return error;
1217 }
1218
1219 static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios * old)
1220 {
1221 #ifdef _DEBUG_TTYFUNCS
1222         printk(KERN_DEBUG "capinc_tty_set_termios\n");
1223 #endif
1224 }
1225
1226 static void capinc_tty_throttle(struct tty_struct *tty)
1227 {
1228         struct capiminor *mp = tty->driver_data;
1229 #ifdef _DEBUG_TTYFUNCS
1230         printk(KERN_DEBUG "capinc_tty_throttle\n");
1231 #endif
1232         mp->ttyinstop = 1;
1233 }
1234
1235 static void capinc_tty_unthrottle(struct tty_struct *tty)
1236 {
1237         struct capiminor *mp = tty->driver_data;
1238         unsigned long flags;
1239
1240 #ifdef _DEBUG_TTYFUNCS
1241         printk(KERN_DEBUG "capinc_tty_unthrottle\n");
1242 #endif
1243         spin_lock_irqsave(&workaround_lock, flags);
1244         mp->ttyinstop = 0;
1245         handle_minor_recv(mp);
1246         spin_unlock_irqrestore(&workaround_lock, flags);
1247 }
1248
1249 static void capinc_tty_stop(struct tty_struct *tty)
1250 {
1251         struct capiminor *mp = tty->driver_data;
1252
1253 #ifdef _DEBUG_TTYFUNCS
1254         printk(KERN_DEBUG "capinc_tty_stop\n");
1255 #endif
1256         mp->ttyoutstop = 1;
1257 }
1258
1259 static void capinc_tty_start(struct tty_struct *tty)
1260 {
1261         struct capiminor *mp = tty->driver_data;
1262         unsigned long flags;
1263
1264 #ifdef _DEBUG_TTYFUNCS
1265         printk(KERN_DEBUG "capinc_tty_start\n");
1266 #endif
1267         spin_lock_irqsave(&workaround_lock, flags);
1268         mp->ttyoutstop = 0;
1269         (void)handle_minor_send(mp);
1270         spin_unlock_irqrestore(&workaround_lock, flags);
1271 }
1272
1273 static void capinc_tty_hangup(struct tty_struct *tty)
1274 {
1275         struct capiminor *mp = tty->driver_data;
1276
1277 #ifdef _DEBUG_TTYFUNCS
1278         printk(KERN_DEBUG "capinc_tty_hangup\n");
1279 #endif
1280         tty_port_hangup(&mp->port);
1281 }
1282
1283 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
1284 {
1285 #ifdef _DEBUG_TTYFUNCS
1286         printk(KERN_DEBUG "capinc_tty_break_ctl(%d)\n", state);
1287 #endif
1288         return 0;
1289 }
1290
1291 static void capinc_tty_flush_buffer(struct tty_struct *tty)
1292 {
1293 #ifdef _DEBUG_TTYFUNCS
1294         printk(KERN_DEBUG "capinc_tty_flush_buffer\n");
1295 #endif
1296 }
1297
1298 static void capinc_tty_set_ldisc(struct tty_struct *tty)
1299 {
1300 #ifdef _DEBUG_TTYFUNCS
1301         printk(KERN_DEBUG "capinc_tty_set_ldisc\n");
1302 #endif
1303 }
1304
1305 static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
1306 {
1307 #ifdef _DEBUG_TTYFUNCS
1308         printk(KERN_DEBUG "capinc_tty_send_xchar(%d)\n", ch);
1309 #endif
1310 }
1311
1312 static const struct tty_operations capinc_ops = {
1313         .open = capinc_tty_open,
1314         .close = capinc_tty_close,
1315         .write = capinc_tty_write,
1316         .put_char = capinc_tty_put_char,
1317         .flush_chars = capinc_tty_flush_chars,
1318         .write_room = capinc_tty_write_room,
1319         .chars_in_buffer = capinc_tty_chars_in_buffer,
1320         .ioctl = capinc_tty_ioctl,
1321         .set_termios = capinc_tty_set_termios,
1322         .throttle = capinc_tty_throttle,
1323         .unthrottle = capinc_tty_unthrottle,
1324         .stop = capinc_tty_stop,
1325         .start = capinc_tty_start,
1326         .hangup = capinc_tty_hangup,
1327         .break_ctl = capinc_tty_break_ctl,
1328         .flush_buffer = capinc_tty_flush_buffer,
1329         .set_ldisc = capinc_tty_set_ldisc,
1330         .send_xchar = capinc_tty_send_xchar,
1331         .install = capinc_tty_install,
1332         .cleanup = capinc_tty_cleanup,
1333 };
1334
1335 static int __init capinc_tty_init(void)
1336 {
1337         struct tty_driver *drv;
1338         int err;
1339
1340         if (capi_ttyminors > CAPINC_MAX_PORTS)
1341                 capi_ttyminors = CAPINC_MAX_PORTS;
1342         if (capi_ttyminors <= 0)
1343                 capi_ttyminors = CAPINC_NR_PORTS;
1344
1345         capiminors = kzalloc(sizeof(struct capi_minor *) * capi_ttyminors,
1346                              GFP_KERNEL);
1347         if (!capiminors)
1348                 return -ENOMEM;
1349
1350         drv = alloc_tty_driver(capi_ttyminors);
1351         if (!drv) {
1352                 kfree(capiminors);
1353                 return -ENOMEM;
1354         }
1355         drv->owner = THIS_MODULE;
1356         drv->driver_name = "capi_nc";
1357         drv->name = "capi";
1358         drv->major = 0;
1359         drv->minor_start = 0;
1360         drv->type = TTY_DRIVER_TYPE_SERIAL;
1361         drv->subtype = SERIAL_TYPE_NORMAL;
1362         drv->init_termios = tty_std_termios;
1363         drv->init_termios.c_iflag = ICRNL;
1364         drv->init_termios.c_oflag = OPOST | ONLCR;
1365         drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1366         drv->init_termios.c_lflag = 0;
1367         drv->flags =
1368                 TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS |
1369                 TTY_DRIVER_DYNAMIC_DEV;
1370         tty_set_operations(drv, &capinc_ops);
1371
1372         err = tty_register_driver(drv);
1373         if (err) {
1374                 put_tty_driver(drv);
1375                 kfree(capiminors);
1376                 printk(KERN_ERR "Couldn't register capi_nc driver\n");
1377                 return err;
1378         }
1379         capinc_tty_driver = drv;
1380         return 0;
1381 }
1382
1383 static void __exit capinc_tty_exit(void)
1384 {
1385         tty_unregister_driver(capinc_tty_driver);
1386         put_tty_driver(capinc_tty_driver);
1387         kfree(capiminors);
1388 }
1389
1390 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1391
1392 static inline int capinc_tty_init(void)
1393 {
1394         return 0;
1395 }
1396
1397 static inline void capinc_tty_exit(void) { }
1398
1399 #endif /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
1400
1401 /* -------- /proc functions ----------------------------------------- */
1402
1403 /*
1404  * /proc/capi/capi20:
1405  *  minor applid nrecvctlpkt nrecvdatapkt nsendctlpkt nsenddatapkt
1406  */
1407 static int capi20_proc_show(struct seq_file *m, void *v)
1408 {
1409         struct capidev *cdev;
1410         struct list_head *l;
1411
1412         mutex_lock(&capidev_list_lock);
1413         list_for_each(l, &capidev_list) {
1414                 cdev = list_entry(l, struct capidev, list);
1415                 seq_printf(m, "0 %d %lu %lu %lu %lu\n",
1416                         cdev->ap.applid,
1417                         cdev->ap.nrecvctlpkt,
1418                         cdev->ap.nrecvdatapkt,
1419                         cdev->ap.nsentctlpkt,
1420                         cdev->ap.nsentdatapkt);
1421         }
1422         mutex_unlock(&capidev_list_lock);
1423         return 0;
1424 }
1425
1426 static int capi20_proc_open(struct inode *inode, struct file *file)
1427 {
1428         return single_open(file, capi20_proc_show, NULL);
1429 }
1430
1431 static const struct file_operations capi20_proc_fops = {
1432         .owner          = THIS_MODULE,
1433         .open           = capi20_proc_open,
1434         .read           = seq_read,
1435         .llseek         = seq_lseek,
1436         .release        = single_release,
1437 };
1438
1439 /*
1440  * /proc/capi/capi20ncci:
1441  *  applid ncci
1442  */
1443 static int capi20ncci_proc_show(struct seq_file *m, void *v)
1444 {
1445         struct capidev *cdev;
1446         struct capincci *np;
1447
1448         mutex_lock(&capidev_list_lock);
1449         list_for_each_entry(cdev, &capidev_list, list) {
1450                 mutex_lock(&cdev->lock);
1451                 list_for_each_entry(np, &cdev->nccis, list)
1452                         seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
1453                 mutex_unlock(&cdev->lock);
1454         }
1455         mutex_unlock(&capidev_list_lock);
1456         return 0;
1457 }
1458
1459 static int capi20ncci_proc_open(struct inode *inode, struct file *file)
1460 {
1461         return single_open(file, capi20ncci_proc_show, NULL);
1462 }
1463
1464 static const struct file_operations capi20ncci_proc_fops = {
1465         .owner          = THIS_MODULE,
1466         .open           = capi20ncci_proc_open,
1467         .read           = seq_read,
1468         .llseek         = seq_lseek,
1469         .release        = single_release,
1470 };
1471
1472 static void __init proc_init(void)
1473 {
1474         proc_create("capi/capi20", 0, NULL, &capi20_proc_fops);
1475         proc_create("capi/capi20ncci", 0, NULL, &capi20ncci_proc_fops);
1476 }
1477
1478 static void __exit proc_exit(void)
1479 {
1480         remove_proc_entry("capi/capi20", NULL);
1481         remove_proc_entry("capi/capi20ncci", NULL);
1482 }
1483
1484 /* -------- init function and module interface ---------------------- */
1485
1486
1487 static int __init capi_init(void)
1488 {
1489         const char *compileinfo;
1490         int major_ret;
1491
1492         major_ret = register_chrdev(capi_major, "capi20", &capi_fops);
1493         if (major_ret < 0) {
1494                 printk(KERN_ERR "capi20: unable to get major %d\n", capi_major);
1495                 return major_ret;
1496         }
1497         capi_class = class_create(THIS_MODULE, "capi");
1498         if (IS_ERR(capi_class)) {
1499                 unregister_chrdev(capi_major, "capi20");
1500                 return PTR_ERR(capi_class);
1501         }
1502
1503         device_create(capi_class, NULL, MKDEV(capi_major, 0), NULL, "capi");
1504
1505         if (capinc_tty_init() < 0) {
1506                 device_destroy(capi_class, MKDEV(capi_major, 0));
1507                 class_destroy(capi_class);
1508                 unregister_chrdev(capi_major, "capi20");
1509                 return -ENOMEM;
1510         }
1511
1512         proc_init();
1513
1514 #if defined(CONFIG_ISDN_CAPI_CAPIFS) || defined(CONFIG_ISDN_CAPI_CAPIFS_MODULE)
1515         compileinfo = " (middleware+capifs)";
1516 #elif defined(CONFIG_ISDN_CAPI_MIDDLEWARE)
1517         compileinfo = " (no capifs)";
1518 #else
1519         compileinfo = " (no middleware)";
1520 #endif
1521         printk(KERN_NOTICE "CAPI 2.0 started up with major %d%s\n",
1522                capi_major, compileinfo);
1523
1524         return 0;
1525 }
1526
1527 static void __exit capi_exit(void)
1528 {
1529         proc_exit();
1530
1531         device_destroy(capi_class, MKDEV(capi_major, 0));
1532         class_destroy(capi_class);
1533         unregister_chrdev(capi_major, "capi20");
1534
1535         capinc_tty_exit();
1536 }
1537
1538 module_init(capi_init);
1539 module_exit(capi_exit);